Hello! I've been getting into cycle.travel recently, it's very quickly becoming indispensable :)
One thing that has been puzzling me is routing over tracks. For instance this track will refuse to be routed upon, even if I drag a waypoint on top of it. If there's an explicit bicycle:yes then it seems to work though, e.g. here.
Obviously the track tag covers all sorts of routes and what's considered cyclable gets very hazy very quickly. It would be nice if it fell back to treating them the same as footpaths, i.e. I could drag a waypoint on top and routed as if I got off and walked for a bit.